If you want to change the paper size of your document (for example, print a US Letter-sized PDF on A4 paper), you can change the printing format for the document.
Open the menu at the top-right of the window, then select
Select the
Choose a Page Scaling from the drop-down list.
None: do not perform page scaling.
Shrink to Printable Area: document pages larger than the printable area are reduced to fit the printable area of the printer page.
Fit to Printable Area: document pages are enlarged or reduced as required to fit the printable area of the printer page.
Click